metamaterial

plural metamaterials

1. engineeringAny material engineered to have a property that is rarely observed in naturally occurring materials; especially

   This study paves the way for investigating complex contact-based dynamics of microgranular media, demonstrates a novel acoustic metamaterial, and yields a new approach to studying micro- to nanoscale contact mechanics in multiparticle networks..

   2015, Morgan Hiraiwa, Maroun Abi Ghanem, Samuel P. Wallen, Amey Khanolkar, Alexei A. Maznev, Nicholas Boechler, “Complex contact-based dynamics of microsphere monolayers revealed by resonant attenuation of surface acoustic waves”, in arXiv

   1 more example

   Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures, can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses.

   2016, Hou-Tong Chen, Antoinette J Taylor, Nanfang Yu, “A review of metasurfaces: physics and applications”, in arXiv

2. Any material engineered to have a property that is rarely observed in naturally occurring materials; especially:
   1. engineeringAny material that obtains its electromagnetic properties from its structure rather than from its chemical composition; especially a material engineered to have features of a size less than that of the wavelength of a class of electromagnetic radiation.